From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Radiator performance, including the square tube matrix, corrosion prevention, and tests on the effectiveness of louvres and shutters.
| Identifier | ExFiles\Box 29\3\ Scan265 | |
| Date | 21th August 1930 | |
| Hs{Lord Ernest Hives - Chair}/Wm2/AD21.8.30 contd. -2- for by the fact that it holds rather less water. From the excellent figures of the Chrysler we feel that we could, with advantage, have more indirect cooling surface in the radiator without losing efficiency. This would reduce the weight of the matrix by cutting down the solder used and the water carried. The square tube matrix as it stands can certainly be cleaned but one could hardly be sure of making a 100% job of one that was choked without removing the top tank. Fortunately, the steps taken to prevent corrosion seem to have largely eliminated deposit in the matrix judging from our last 10,000 miles car (24-EX). We are now carrying out some low speed tests on the square tube matrix. Louvres and Shutters . Maximum speed tests show how vitally important bonnet ventilation becomes with increasing car velocity. At 60 M.P.H. opening the shutters drops the top water temperature 5½°C. at 75 M.P.H. 6½°C. while at 80 M.P.H. or maximum speed the same ventilation drops the top water temperature 8°C. Additionally, this ventilation is required most at the higher speeds because the car in standard condition runs about 8°C. hotter at 80 M.P.H. than at 60 M.P.H. Louvres are definitely more efficient than bonnet shutters at all speeds. | ||